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 TM 10-3930-644-14&P
TOPIC 4. CONTROL VALVE
The direction of travel of the truck is obtained by
4. Disconnect wires from neutral start switch.
operating a control valve which is mounted on the
transmission housing. The valve controls the pump
5. Disconnect tube assembly from valve. Plug or
pressure, direction of travel and inching.
cap tube to prevent contamination.
When control valve repair or replacement is necessary,
6. Loosen the control valve mounting capscrews
the following procedure should be used:
and remove control valve assembly. Remove
and discard gasket, then place a clean covering
A. REMOVAL
over exposed area of transmission to prevent
NOTE
4. Place control valve assembly in a clean work
It is not necessary to remove the
area for disassembly.
transmission from the truck in order
to service or replace the control
B. DISASSEMBLY
valve.
1. Remove floor plate.
1. After control valve has been removed from
transmission housing, make sure all dirt and
2. Disconnect the control linkage at the control
foreign material is removed from the valve body.
valve. Remove return to neutral mechanism.
NOTE
3. Clean valve and surrounding area to keep
Take care not to damage valve body
contaminants out of transmission.
during disassembly.
Use tools
properly.
Figure 4-1. Control Valve
R-171-1
3-129
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